Cutting/boring bush

[Col21Participant @col21]

What sort/shape should a cutter be boring out a copper coated bush in a milling machine. Was going to use a piece of 6mm hss.

[Col21Participant @col21]

[Nick_GParticipant @nick_g]

.

When you say coated. How thick is the coating and what is the base material under the coating.?

I ask this as if it's not a very thick coating you may be able to get under it in the first pass.

Are you also sure the bush is copper.?

Nick

[David Standing 1Participant @davidstanding1]

And, following on from Nick's post, are you sure it isn't an oilite bush?

[Col21Participant @col21]

It's a copper coated small end bush. I assume it'll be steel. Only got to remove about 0.4mm

[JasonBModerator @jasonb]

What size is the bore as that will determine what sort of tools will fit down the hole.

Do you have a boring head?

[Col21Participant @col21]

50mm bore by about 50mm deep. Yeah a vertex adjustable boring head which has 18mm holes

[JasonBModerator @jasonb]

Piece of 18mm bar drilled across at the end to take your 6mm HSS toolbit and then cross drilled for a grub screw say M5 to retain the bit. Should be nice and rigid which will help keep the bore parallel.

[Col21Participant @col21]

Thanks yeah that what I was thinking but what shape should I grind the cutter to get the best result. I.e. Large radius , relief and speed etc

Edited By Rocketman on 18/08/2017 18:59:45

[HOWARDTParticipant @howardt]

Is it a Glacier bush, or whatever they call themselves these days. They make steel backed bushes with various bearing materials. If it is then it can be pushed out and a replacement fitted, no matching necessary.

[JasonBModerator @jasonb]

Click the "988 photos" under my avitar and look in the "sketches" album, there are 4 photos there of a between ctrs boring bar numbered bb1-4 they show a suitable cutter profile.

[Author]

Posts